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ABS light won't go off
The ABS system monitors the wheel speed sensors. When one or more wheels seem to be off from where they should be the ABS system modulates the chosen wheels brakes in order to match the speed of the others. If...
AC malfunction
Hi there, thanks for writing in about your 1994 Mercedes-Benz 300D. This sounds like you may have a leak in your A/C system. I would start by checking the various fittings and hoses for leaks. Check the hose manifolds on...
Clunking noise when put into gear, rough shifiting
Hey there. Thanks for writing in about your 1992 Mercedes-Benz 300D. This sounds like the differential bushings could be worn. I would also check for vacuum leaks. There is a component called a vacuum switchover valve that helps to control...
Interior lights don't work when doors are opened
Hey there, thanks for writing in about your 1990 Mercedes-Benz 300D. Typically there are a couple of different options in the interior light switches. There is usually an option to turn them on manually, or to have them come on...
Lights and gauges quit working, buzzing noise
Hey there, I would start by testing the fuses. This is a common problem on this generation of Mercedes diesels. There is an OVP relay that sits behind the battery which are also a known source of problems. I would...
Car loses power. 1993 Mercedes-Benz 300D
Hello. It sounds like there is a problem with the turbo system. There could be a bad wastegate, the turbocharger could be wearing out, or other components to the turbocharger system may be malfunctioning. I suggest that you have the...
Down one chamber
I owned a 300D and 300SD, both 1983's. You can have a bad glow plug or two even if the glow plug light is lighting when you turn the key on. The easiest way to determine if a glow plug...

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